US4656719A - Method of preparing bimetallic tubes for roll-forming ribs - Google Patents
Method of preparing bimetallic tubes for roll-forming ribs Download PDFInfo
- Publication number
- US4656719A US4656719A US06/622,138 US62213884A US4656719A US 4656719 A US4656719 A US 4656719A US 62213884 A US62213884 A US 62213884A US 4656719 A US4656719 A US 4656719A
- Authority
- US
- United States
- Prior art keywords
- tube
- pipe
- outer pipe
- inner pipe
- ribs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000007788 roughening Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
- B23P9/02—Treating or finishing by applying pressure, e.g. knurling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49927—Hollow body is axially joined cup or tube
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force
Definitions
- the subject of the invention concerns a method of drawing ribs on bimetallic tubes, in which the ribs are drawn from an external tube into which initial compressive stress has been introduced.
- Ribs on tubes are drawn by acting on the tube with rotary tools comprising roll-formed disks.
- rotary tools comprising roll-formed disks.
- application No. P-241323 a method of drawing ribs on tubes is known, in which before placing the tube in the zone of the action of disk tools initial compressive stress is introduced into the tube. In this way a discharge has been achieved during the operation of the tool from axial loads bending out the roll-formed disks practically from the first stage of the working contact of the tool with the tube.
- For the purpose of inducing compressive stresses in the tube in the application No. P-241323 a is provided.
- the essence of the method of preparing bimetallic tubes or pipes according to the invention in which by the action of disk tools ribs from the external tube are drawn and to the external tube initial compressive stress is introduced, consists in that roughness of the external surface of the internal tube is increased along two segments, each of a length 1 of from 0.8 to 3 d, where d denotes the outer diameter of the internal tube, and the said segments are spaced from each other by a distance L-(1.6-6) d, where L denotes the length of the external tube.
- the internal tube is placed in the external tube so that the ends of the external tube are in line with the outer ends of the roughened segments of the internal tube.
- the ends of the external tube are clamped to the inner tube over a length of from 0.5 to 1.5 of the length of the roughened segments, with a simultaneous axial displacement of the deformed volume of the material of the external tube in the direction of center of the tube.
- the axial deformation has a quantity corresponding to compressive stresses applied to the material of the external tube.
- assembled tubes are placed in the zone of the action of roll-forming tools and ribs are drawn on the external tube. It is preferable to form during clamping at least one end of the external tube in a conical shape.
- the method according to the invention enables a durable connection of the external tube with the internal tube in an accurately established position of the ends of the tubes and permits introducing to the external tube the necessary compressive stresses which facilitates rib-forming.
- An advantage of the method is also that the merged tubes during rolling do not displace in relation to each other, and elimination of the use of instruments for the maintenance of initial stresses in the tube reduces labor-consumption of operations in the production of ribbed bimetallic tubes.
- production of ribbed bimetallic tubes by this method enables achieving considerable material savings in relation to so-called free rolling.
- a bimetallic tube consists of an internal tube 1 and an external tube 2. At selected distances from the ends of the internal tube 1 there are segments 3 and 4 of the surface of the tube of increased roughness.
- the increase of roughness can be effected, for example, by knurling, grooving or threading.
- the length l of the segment of increased roughness is from 0.8 to 3 of the diameter d of the internal tube.
- At least one of the deformed ends of the external tube 2 is deformed so that a part of the deformed end of the tube is displaced in the axial direction, towards the center A of the external tube 2.
- the axially displaced material of the external tube 2 corresponds to the desired deformation to be induced by introducing compressive stresses necessary for drawing the ribs.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
A method of preparing bimetallic tubes or pipes for roll-forming ribs therefrom, in which the external tube is subjected to initial compressive stress is introduced, is characterized by roughening the ends of the internal tube, and after placing the internal tube in the external tube the ends of the external tube are clamped on the roughened segments of the internal tube with simultaneous axial displacement of a part of the material of the external tube corresponding to said compressive stresses of a required quantity. From the tube assembly thus prepared ribs are drawn. It is preferable that at least one end of the external tube is formed conically during clamping.
Description
The subject of the invention concerns a method of drawing ribs on bimetallic tubes, in which the ribs are drawn from an external tube into which initial compressive stress has been introduced.
Ribs on tubes are drawn by acting on the tube with rotary tools comprising roll-formed disks. From the Polish patent specification, application No. P-241323, a method of drawing ribs on tubes is known, in which before placing the tube in the zone of the action of disk tools initial compressive stress is introduced into the tube. In this way a discharge has been achieved during the operation of the tool from axial loads bending out the roll-formed disks practically from the first stage of the working contact of the tool with the tube. For the purpose of inducing compressive stresses in the tube in the application No. P-241323 a is provided.
In the case of drawing ribs on bimetallic tubes such a solution is practically useless because it is difficult to meet the requirement of accurately setting both tubes in relation to each other with simultaneous application of a compressive force on the external tube.
The essence of the method of preparing bimetallic tubes or pipes according to the invention, in which by the action of disk tools ribs from the external tube are drawn and to the external tube initial compressive stress is introduced, consists in that roughness of the external surface of the internal tube is increased along two segments, each of a length 1 of from 0.8 to 3 d, where d denotes the outer diameter of the internal tube, and the said segments are spaced from each other by a distance L-(1.6-6) d, where L denotes the length of the external tube. Next, the internal tube is placed in the external tube so that the ends of the external tube are in line with the outer ends of the roughened segments of the internal tube. Next, the ends of the external tube are clamped to the inner tube over a length of from 0.5 to 1.5 of the length of the roughened segments, with a simultaneous axial displacement of the deformed volume of the material of the external tube in the direction of center of the tube. The axial deformation has a quantity corresponding to compressive stresses applied to the material of the external tube. Next, assembled tubes are placed in the zone of the action of roll-forming tools and ribs are drawn on the external tube. It is preferable to form during clamping at least one end of the external tube in a conical shape.
The method according to the invention enables a durable connection of the external tube with the internal tube in an accurately established position of the ends of the tubes and permits introducing to the external tube the necessary compressive stresses which facilitates rib-forming. An advantage of the method is also that the merged tubes during rolling do not displace in relation to each other, and elimination of the use of instruments for the maintenance of initial stresses in the tube reduces labor-consumption of operations in the production of ribbed bimetallic tubes. Moreover, production of ribbed bimetallic tubes by this method enables achieving considerable material savings in relation to so-called free rolling.
The subject of the invention will be now explained in more detail in the drawing presenting a bimetallic tube assembly with introduced initial compressive stress, prepared for drawing ribs.
A bimetallic tube consists of an internal tube 1 and an external tube 2. At selected distances from the ends of the internal tube 1 there are segments 3 and 4 of the surface of the tube of increased roughness. The increase of roughness can be effected, for example, by knurling, grooving or threading. The length l of the segment of increased roughness is from 0.8 to 3 of the diameter d of the internal tube. At least one of the deformed ends of the external tube 2 is deformed so that a part of the deformed end of the tube is displaced in the axial direction, towards the center A of the external tube 2. The axially displaced material of the external tube 2 corresponds to the desired deformation to be induced by introducing compressive stresses necessary for drawing the ribs.
Claims (2)
1. In a method of preparing bimetallic pipes for roll-forming ribs from the external surface thereof, comprising the steps of: introducing an inner pipe into an outer pipe to form a bimetallic assembly, subjecting the assembly to initial compression stresses, and then forming ribs on the outer pipe by the action of rotary roller tools, the improvements which are characterized in that, before introducing the inner pipe into the outer pipe, the external surface of the inner pipe is roughed over at two sections, one at each end, each roughened section having a length 1=(0.8-3) d, where d is the outer diameter of the inner pipe, said sections being spaced from each other by a distance L=(1.6-6) d, where L is the length of outer pipe, the inner pipe is then introduced into the outer pipe so that the ends of the outer pipe are aligned with the roughened ends of the inner pipe, and then the ends of the outer pipe are clamped on the inner pipe over a distance from about 0.5-1.5 times the length of said roughened sections of the inner pipe, and simultaneously axially displacing parts of the outer pipe towards the middle of the pipe assembly, the magnitude of which corresponds to said compression stresses set up in the material of the outer pipe to enable forming said ribs.
2. A method as defined in claim 1, characterized in that at least one end of the outer pipe is conically formed while being clamped on the inner pipe.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD84263252A DD219685A5 (en) | 1984-05-22 | 1984-05-22 | PROCESS FOR PUNCHING THE RIBS ON BIMETAL TUBES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4656719A true US4656719A (en) | 1987-04-14 |
Family
ID=5557209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/622,138 Expired - Fee Related US4656719A (en) | 1984-05-22 | 1984-06-19 | Method of preparing bimetallic tubes for roll-forming ribs |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4656719A (en) |
| DD (1) | DD219685A5 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1960042A (en) * | 1930-06-18 | 1934-05-22 | Smith Corp A O | Securing protective covering to metallic surfaces |
| US3239931A (en) * | 1964-12-08 | 1966-03-15 | Guarnaschelli Stephen | Method of making plastic lined metal tubing |
| US3461523A (en) * | 1965-11-06 | 1969-08-19 | Siemens Ag | Method of producing a multilaminated tube |
| US4125924A (en) * | 1977-04-04 | 1978-11-21 | United States Steel Corporation | Method of producing composite metal pipe |
| US4400862A (en) * | 1978-08-11 | 1983-08-30 | Tetra Pak Developpement Sa | Method of manufacturing packing containers |
| US4403385A (en) * | 1980-10-24 | 1983-09-13 | Amtrol Inc. | Process of preparing a double wall heat exchanger |
-
1984
- 1984-05-22 DD DD84263252A patent/DD219685A5/en unknown
- 1984-06-19 US US06/622,138 patent/US4656719A/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1960042A (en) * | 1930-06-18 | 1934-05-22 | Smith Corp A O | Securing protective covering to metallic surfaces |
| US3239931A (en) * | 1964-12-08 | 1966-03-15 | Guarnaschelli Stephen | Method of making plastic lined metal tubing |
| US3461523A (en) * | 1965-11-06 | 1969-08-19 | Siemens Ag | Method of producing a multilaminated tube |
| US4125924A (en) * | 1977-04-04 | 1978-11-21 | United States Steel Corporation | Method of producing composite metal pipe |
| US4400862A (en) * | 1978-08-11 | 1983-08-30 | Tetra Pak Developpement Sa | Method of manufacturing packing containers |
| US4403385A (en) * | 1980-10-24 | 1983-09-13 | Amtrol Inc. | Process of preparing a double wall heat exchanger |
Also Published As
| Publication number | Publication date |
|---|---|
| DD219685A5 (en) | 1985-03-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: ZAKLADY URZADZEN CHEMICZNYCH METALCHEM, 47-225 KED Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:PRZYBYLA, JANUSZ;GOZDZIEWICZ, ZYGMUNT;SZAL, ANDRZEJ;AND OTHERS;REEL/FRAME:004291/0502 Effective date: 19840528 |
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| FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
| REMI | Maintenance fee reminder mailed | ||
| LAPS | Lapse for failure to pay maintenance fees | ||
| STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
| FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19910414 |